Infinity-Corrected Brightfield and Darkfield Microscope Objective Lens

Name: Infinity-Corrected Brightfield and Darkfield Microscope Objective Lens
Brand: Accuray Photontech, Ltd.
Price: 1190.00 USD
Availability: InStock

Description

This brightfield and darkfield microscope objective lens is designed for high-resolution imaging, precision optical inspection, and advanced microscopy applications. Featuring an infinity-corrected apochromatic optical design with high numerical aperture (NA), the objective delivers diffraction-limited performance across the visible spectrum while minimizing chromatic and spherical aberrations.

Optimized for both brightfield and darkfield illumination configurations, the objective enables high-contrast imaging of fine surface details, defects, edges, and microstructures. Its long working distance and standard RMS threading make it ideal for integration into industrial microscopy systems, machine vision platforms, laser focusing systems, semiconductor inspection setups, and scientific imaging applications.

The lens supports coaxial observation and precision visible laser focusing, making it particularly suitable for metrology, laser processing alignment, electronics inspection, biomedical imaging, and precision manufacturing environments.

Key technical features include:

High numerical aperture (NA) for high-resolution imaging and fine detail capture
Ideal for Brightfield and Darkfield Microscopy Applications
Chromatic aberration correction for accurate color reproduction and minimized color fringing
Plan Apochromat Design
Standard RMS threading for compatibility with conventional microscopes and optical mounts

These objective lenses are ideal for applications in microscopy, machine vision, laser systems, and precision optical inspection where superior resolution and image quality are critical.

Benefits of Darkfield Microscopy for Precision Inspection

Darkfield microscopy enhances the visibility of edges, particles, defects, and surface irregularities by illuminating the sample with oblique light that does not directly enter the objective lens. Only scattered light from the specimen is collected, producing high-contrast images against a dark background.

This imaging technique is widely used in semiconductor inspection, materials science, precision manufacturing, and biological imaging because it reveals fine details that may remain invisible under standard brightfield illumination.

Specifications

Magnification:	20
Numerical Aperture:	0.45
Focal Length:	10 mm
Working Distance:	3 mm
Design Type:	Air Immersion
Wavelength Range:	Visible
Wavelength:	430-660 nm
Object Side Resolution:	0.61um
Parfocal Distance:	45 mm
Depth Of Field:	1.36 um
CompatibleTube Lens FocalLength:	200 mm
Weight:	137 g
Manufacturer Part Number (MPN):	OBJ-20X0.45-W26-WD3
FindLight SKU:	FL-24365

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Features

High numerical aperture (NA)
High-resolution with diffraction-limited performance
Plan Field
Apochromatic aberration correction
Accurate color reproduction
Ideal for Brightfield and Darkfield Microscopy Applications

Applications

Brightfield and darkfield microscope objective lenses are widely used in industrial inspection, semiconductor metrology, machine vision, biomedical imaging, and laser processing systems where high contrast and high-resolution imaging are required.

Darkfield microscopy is particularly effective for detecting surface defects, scratches, contamination, edge features, and fine microstructures that are difficult to observe under conventional brightfield illumination.

These objective lenses are also commonly integrated into precision optical inspection systems, laser alignment platforms, electronics manufacturing equipment, and scientific imaging instruments.

Export & Trade Information

ECCN:	EAR99
HTS Code:	9002.19.00
Estimated US Tariff:	25%

Importing, tariffs & codes (Quick Guide) →

$1,190.00

Volume Pricing:

Qty	Unit Price	Extended Price
5	$1,079.00	$5,395.00
10	$939.00	$9,390.00

Discounts apply automatically in cart.

Shipping:

$70.00

Ships from:

China

Est. US Tariff:

$297.50

Processing:

7 days (Est. arrival by Jun 18)

Delivers to:

United States

Made by:

Accuray Photontech, Ltd.

Made in:

China

Warranty:

View full terms

Returns:

View return policy

Sold by:

Accuray Photontech, Ltd.

On FindLight:

since 2026

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Frequently Asked Questions

What is a darkfield microscope objective lens?

A darkfield microscope objective lens is a specialized optical objective designed for darkfield microscopy, an imaging technique that enhances the visibility of fine surface features, particles, defects, and microstructures. In darkfield imaging, the sample is illuminated with oblique light so that only scattered light from the specimen enters the objective lens, producing bright features against a dark background. Darkfield microscope objectives are commonly used in semiconductor inspection, materials science, biological imaging, precision manufacturing, and industrial metrology where high-contrast visualization of small defects or edges is required.

What is the difference between brightfield and darkfield microscopy?

Brightfield and darkfield microscopy differ primarily in how the sample is illuminated and how image contrast is generated. In brightfield microscopy, light passes directly through or reflects from the sample into the objective lens, producing a bright background with darker sample features. This is the most common microscopy technique and is suitable for general imaging applications. In darkfield microscopy, direct illumination is excluded from the objective lens, and only scattered light from the sample is collected. This creates a dark background with bright, high-contrast features, making it easier to detect scratches, particles, edges, contamination, and fine surface details that may be difficult to observe in brightfield imaging. Darkfield microscopy is especially useful for precision inspection, semiconductor analysis, and surface defect detection.

What are infinity-corrected microscope objectives?

Infinity-corrected microscope objectives are optical objectives designed to project collimated (parallel) light after the objective lens rather than forming an image directly at a fixed tube length. A separate tube lens is then used to form the final image. This optical architecture offers several advantages, including: Improved optical flexibility, Easier integration of filters, beam splitters, and optical components, Better aberration correction, Enhanced imaging performance across larger fields of view. Infinity-corrected objectives are widely used in modern industrial microscopy systems, machine vision platforms, laser processing equipment, and scientific imaging instruments.

Why is high numerical aperture important in microscopy?

High numerical aperture (NA) is critical in microscopy because it determines the objective lens’s ability to collect light and resolve fine details. Objectives with higher NA provide: Better spatial resolution, Improved image brightness, Higher contrast, Enhanced detection of small features. In precision imaging and inspection applications, a high-NA microscope objective enables clearer visualization of microstructures, defects, particles, and fine surface features. High numerical aperture is particularly important in semiconductor inspection, biological imaging, laser focusing, and high-resolution industrial metrology.

What applications use darkfield microscope objectives?

Darkfield microscope objectives are used in a wide range of scientific, industrial, and manufacturing applications that require high-contrast imaging of small features or surface defects. Common applications include: Semiconductor and electronics inspection, Precision optical metrology, Materials science and surface analysis, Biomedical and biological imaging, Particle and contamination detection, Machine vision systems Laser processing alignment and monitoring, Inspection of scratches, cracks, edges, and microstructures. Darkfield imaging is especially valuable in applications where conventional brightfield microscopy provides insufficient contrast.

Can microscope objectives be used for laser focusing?

Yes. Certain microscope objectives can be used for precision laser focusing applications, particularly in laser micromachining, laser alignment, semiconductor processing, biomedical imaging, and optical measurement systems. High-quality microscope objectives with high numerical aperture and low optical aberrations can focus laser beams into very small spot sizes with excellent precision. Infinity-corrected objectives are especially useful because they integrate easily into advanced optical systems. When selecting a microscope objective for laser focusing, important considerations include: Wavelength compatibility, Numerical aperture, Working distance, Optical coatings, Power handling capability, Aberration correction.

What is an apochromatic microscope objective?

An apochromatic microscope objective is a high-performance optical objective designed to minimize chromatic and spherical aberrations across multiple wavelengths of light. Compared to standard achromatic objectives, apochromatic objectives provide: Superior color correction, Higher image sharpness, Improved contrast, Better edge-to-edge image quality, Enhanced resolution. Apochromatic microscope objectives are widely used in advanced scientific imaging, semiconductor inspection, industrial metrology, fluorescence microscopy, and precision optical systems where maximum imaging accuracy is required.

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